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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f30260bbba7bdce854a0ac94b416f972896759ee9c5afccf8cb29b3af946e02' 
  AND token = 'AU42Mk/AQ7WS20PMUkJDm6C7zHoxmKQLLwwkwLNCyAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}